(It is night and raining outside of the Tree Fort, Finn is sitting at the table while Fionna puts on some hot water)
Fionna: Hey, what kind of coffee do you want?
Finn: Hazelnut! Hazelnut! What if your name was "Zelnut"? And then I would be all like "Hey, Zelnut".
Fionna: That's terrible.
Finn: Hey, Zelnut.
(Irritated, Fionna gently bodyslams Finn, who laughs)
(There is then a knocking sound)
Finn: You hear that?
(The wall is then burstthrough by none other than Susan Strong)
Finn & Fionna: Susan Strong!
Susan: Finn, Fionna, help Susan.
Finn: Of course we will. Susan, what can we do?
Susan: I need your hero heart and your magic.
Finn: My magic?
Susan: (Points to fire boiling the water) Magic of red flower.
(Finn has a flame-light lantern as Susan leads them down the tunnel to the Hyoomen territory, Down in the Hyoomen's territory that find Hyoomen watching them from behind rocks and litter)
Susan: Long ago, my people live in Beautopia. But driven out by Lubs Glubs. We come here. We too scared to fight back. This why we need your hero heart. Hyoomans! (Hyoomen gasp) I'll be back!
(Susan and Finn go on their way)
(The trio come to water)
Susan: Come on, we swim there.
Finn: No, you don't understand. I'm not a fish person. I'm human. So is Fionna.
Susan: (Laughs) We go.
(Susan puts Finn's head under the water and he struggles, Fionna tries to restrain Susan by wrapping her arms around her and Finn is able to come up to the surface with his hat on backwards, he takes it off and gasps for air, Fionna runs to Finn and Susan extends her arm)
Susan: (Examining Finn's head) You no gills. (Finn puts his hat back on, Fionna has a worried look) We take boat.
(On the boat, Finn hangs the lantern on a hook)
Fionna: So where we headed, Susan?
Susan: There. (Points to a raging whirlpool)
(They go down the whirlpool and Finn and Fionna scream, they pop out safely out of a pipe)
Finn: (Laughs) That was awesome.
Susan: Keeps looking for Lubglubs.
(A pool floaty floats ahead)
Susan: (Whispers) No move!
(The floaty floats by)
Susan: Whew, we safe now.
(Susan looks ahead worriedly, a slamming sound can be heard)
Fionna: Hey, you hearing that too?
Susan: Getting close to the Lubglubs' Mashem-Ups.
(That float up to a series of giant stones coming out of the walls slamming together)
Susan: The clashing gates!
(Fionna has a look of fear on his face and she looks at Finn)
Susan: S'okay. Susan know when is safe to pass through.
Finn: Gotta time it just right, eh, Susan?
(They speed through the gates, both Finn & Fionna stay calm, at the last gate half the boat is crushed)
Susan: Oh, good. Still got some boat left.
Finn: Okay Susan, what do we do next.
Susan: Hmm... never made this far before. Just gotta get past Glub Glubs.
Finn: Yeah, what are Lubglubs, exactly?
Susan: They...umm, look, they like this. (Draws an obscure picture with her figure on the boat wood)
Fionna: That looks like a...a...I can't make it out.
Susan: Yes. Lubglubs crazy scary. Hyoomens scared so long. Even Susan. That why glad I meet you two. You have brave heart. (Places her hand on Finn's chest and crushes it in her grip)
Finn: (Weakly) Thank...you...
Fionna: Oh Glob, are you OK, Finn?
Finn: Yeah, I'm fine.
(Susan grabs a conveniently placed outboard motor and turns it on)
Susan: (Excited) We here? We at Beautopia!
(They float close to a dome shaped city)
Susan: We's be alls good once bring red flower to city heart.
(They float close to the city heart, when out a store called "FLOATY" a gush of water comes out)
Fionna: What's making all that swishing?
Susan: Lub glubs! They coming!
(After a moment of tense drama, a pool floaty floats out)
Fionna: Pool floaties?
Susan: (Panicking) Shh! Shh! Too many Lubglub to fight!
(Many pool floaties surround them, Susan begins to hyperventilate and backs away)
Fionna: This is going to be eas-
(The Lub Glub turns into a black monster, and so do all the other "floaties")
Fionna: Oh Glob!
(A Lub Glub is seen chewing on a skull with a hat similar to Fionna's)
Fionna: Did-did-did-did-DID YOU SEE THAT?!
Finn: I know, Fi, I know! I'm scared too! Is it an omen?
(The Lub Glub tries to attack the trio, Susan cowers in fear but Finn and Fionna fight them)
Fionna: Bad news, bro. There's only two of us and more than, um, (Looks at her hand and holds out all her fingers) this many of them!
Finn: We gotta use the fire, like Susan said. Are you okay with that?
Fionna: Yes! I'm okay with that! I'll do whatever Susan says! (Fionna is tackled by a Glub Glub)
Finn: Susan! We need you! (Piledrives a Glub Glub)
Susan: (Whimpers) Susan scared! But Susan brave too. (Grabs lantern) SUUSSSAAANN!!!!! (Jumps and tackles a group of Glub Glubs)
Finn: Yeah, Susan!
(Susan makes a break with the lantern but is pounced on by Glub Glubs)
Susan: (Tosses the lantern) Finn! Fionna!
Fionna: (Catches It) I gots it!
Susan: Red flower! Throw it to city heart!
Fionna: Finn, win aide to fair Susan! Fionna brings the fire!
(Fionna goes as Finn kicks a Glub Glub off Susan)
Finn: Humans and "Hyoomen" got to stick together!
(Finn and Susan fist bump and Susan grabs his arms)
(Susan swings him at a Glub Glub)
Susan: (Looking at Finn) Hmm.
(Fionna climbs up the tower to the city heart, a giant Glub Glub comes out of the water and rise up the tower on the opposite side of Fionna)
Fionna: (Grunting) Almost..there... (At the top there is a furnace with straw that says "Light Fire Here") Oh, so I just toss it in here. Pretty straightforward. Okay, well here I go. (Swing the lantern) one, two, three... (The giant Glub Glub grabs her arm and roars; Fionna' struggles against the Glub Glub and toss the lantern into the furnace)
(All of Beautopia become lit with flames popping out of torches and pipes, the Glub Glubs evaporate leaving behind nothing but torn rubber floaties)
Finn: It's working, Susan! (Fionna comes down) Fionna!
Fionna: Whoa, it is beautiful.
(Later, the Hyoomen Tribe have arrived and are sorting through things with Jake's help)
Finn: You were right, Susan. This place is great. Well, we better get home.
Susan: Finn, you stay.
Finn: No, I can't. I'm not like you.
(Susan takes Finn's hand and puts it in her hat, a look of shock envelops Finn's face)
Fionna: Finn, is everything alright?
Finn: She's human, Fi. She's human.
(Finn hops on and he and Fionna paddle them back, Finn and Fionna wave to Susan and the episode ends)